热电联产型微网系统在能源供应中的建模与选择

Modeling and Selection of CHP Micro-grid System in Energy Supply

对热电联产型微网系统在分布式能源供应中的能量关系进行数学建模,并提出基于建筑层和电力网络层上的2种建模方式。基于能量守恒定律建立电能与热能的能量关系,并确定发电和配电与一次能源的关系,同时为实现减少使用总的一次能源提供理论依据。通过建立经济运行优化结构对电力能源网络层中的3种热电联产系统本身进行分析,并以经济成本、经济数据、技术数据作为约束条件进行分析与讨论,从而为选择系统中发电机组的最佳技术参数作出参考。研究表明,与常规系统相比,选择这种典型的热电联产型微网系统能够在能源供应中实现总一次能源使用明显减少,达到预期目标,并使能源成本降低不少。

Mathematical modeling is built in the combined heat and power micro-grid system for the distributed energy supply system （DESS）, and two modeling methods are proposed based on the building layer and the power network layer. Based on the conservation of energy, the energy relationship between electric energy and heat energy is constructed, and the relationship between power generation and distribution and the primary energy is determined, which provide theoretical basis for the decrease of the total primary energy. In addition, analysis on three combined heat and power systems at power energy network layer is made through the establishment of economic operation optimization structure, and the economic costs, economic data and technical data are set as constraint conditions to make analysis and discussion, all of which are in order to choose the most suitable technical parameters for the generator units. The results indicate that compared with the conventional system, the specific combined heat and power micro-grid system could significantly reduce the rational use of the total primary energy in energy supply, which would achieve the expected goal more quickly and reduce the energy costs to the largest extent.